Design Pattern for Role-based GUI

Hi,
I'm looking for a java design pattern to provide different GUI according to the user role.
For example, If logon user has general user role, the GUI would disable some administrator related menu items...
I think, this kind of functionality is now in use at many applications..
Thanks in advance..
Habin

Hi
I try to explain with some more detail (sorry for my bad english) :
I write a complete hotel reservation app with Java+Bd (relational). This app is used by diferent users types.
The administrator has all privileges (can do every action) and other users can do only some actions (make a reservation, check-in, check-out etc but not modify a
room price for example).
The app is a MDI app, there are a menu and menuitems
and when a user do an actionEvent over a menuItem an InternalFrame is activated and so on. These InternalFrame make possible some actions at app level (ex. : do a check-in).
The menuItems set is controled by the App (is the Controller in MVC design pattern) and the model is represented by a set of user possible actions; so there are a class (UserConfig) with these set of possible actions.
the Controller ask UserConfig abouth the posible action
set and do the enable/disable job. There are a 1 to 1
relationship : each possible actions has a menuItem. And
there are a M to N relationship from User/Action perspective.
With this design (I think is an MVC design) the Controler mantain a UserConfig (via a Relational Database) and the Administrator (via the App) can create or modify the UserConfig objects.
At implementation level, each menu item has a name, and
for each registered user there are the name/id_user pair
of actions. These info (stored in BD) is used to create
the UserConfig objects (via username/password).
Bye

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    Answer Object
    The Answer object is created if the contestant sends an answer and his answer corresponds with the alternatives in the Answer object. E.g if the answer alternatives are a) 100 kilometers and b) 20 kilometers, and the contestant sends an answer c, it is considered as no answer, and the last question is repeated, if the contestant sends a, or b, his answered is compared with the current Answer alternative, and a new question is sent him.
    I have some database tables for managing this module, and basically a Quiz is configured as an XML, where 1 xml is a quiz, and 1 quiz xml can contain many question and answer tags. These are read upon quiz start, and Quiz, Answer, and Question objects are created. Every time a new contestant enters, a new Contestant object is ofcoursed created.
    All the logic takes place in the previously mentioned QuizManager. Any comments on the solution so far would be greatly appreciated.
    If interesting to anyone I can post the classes when I am finished with the module, as a standalone java application without a database.
    Regards,
    Eivind

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